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Rifle Parts

Whether you're building a new rifle from scratch or looking to upgrade an existing firearm, our vast selection of rifle parts has everything you are going to need in that journey. At Rainier Arms' selection of rifle parts, you can find a wide variety of products including lower and upper parts, trigger parts, muzzle devices, and many more. 

Explore our selection of high-quality parts coming from various leading manufacturers like Strike Industries, Magpul, BCM, and many more.

Also, don't forget to check our specially-made Rainier Arms barrels for your firearms.

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  1. Rainier Arms Forged Mil-Spec Upper Receiver
    Rainier Arms Forged Mil-Spec Upper Receiver
    $125.00
    Out of stock
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  2. JP Enterprises .936 Adjustable Bull Barrel Gas Block
    JP Enterprises .936 Adjustable Bull Barrel Gas Block
    $75.95
    Out of stock
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  3. Faxon Firearms PENCIL .308 WIN
    Faxon Firearms PENCIL .308 WIN
    Out of stock
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  4. Noveske AR-15 Gen 3 5.56MM NSR-15 M-LOK Upper - 18" SPR
    Noveske AR-15 Gen 3 5.56MM NSR-15 M-LOK Upper - 18" SPR
    $1,520.00
    Out of stock
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  5. Ballistic Advantage Premium Series 416R SS 223 Wylde 18" SPR Fluted
    Ballistic Advantage Premium Series 416R SS 223 Wylde 18" SPR Fluted
    $256.50
    Out of stock
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  6. Faxon Firearms 6.5 Grendel 416-R Stainless Gunner Barrel MATCH SERIES - 18"
    Faxon Firearms 6.5 Grendel 416-R Stainless Gunner Barrel MATCH SERIES - 18"
    $234.60
    Out of stock
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  7. Noveske SPR 5.56MM Barrel - 18
    Noveske SPR 5.56MM Barrel - 18
    $451.25
    Out of stock
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  8. Noveske Lightweight Stainless Barrel - 18"
    Noveske Lightweight Stainless Barrel - 18"
    $451.25
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  9. Magpul Ladder Style Rail Protector
    Magpul Ladder Style Rail Protector
    Out of stock
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  10. Noveske AR-15 N4 5.56 NATO SPR Upper - 18"
    Noveske AR-15 N4 5.56 NATO SPR Upper - 18"
    $1,543.75
    Out of stock
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  11. Magpul BAD Lever
    Magpul BAD Lever
    $31.30
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Items 65-75 of 75

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Barrel Profile
  1. Full-fluted 5 items
  2. Lightweight 3 items
  3. Non-fluted 8 items
  4. MK12 SPR 4 items
Caliber
  1. .22 ARC 2 items
  2. .223 Wylde 7 items
  3. .308 1 item
  4. .308 Win 4 items
  5. .45 ACP 1 item
  6. 5.56 NATO 6 items
  7. 6mm ARC 6 items
  8. 6.5 Creedmoor 9 items
  9. 6.5 Grendel 5 items
  10. 6MM Creedmoor 7 items
  11. 7.62x51 1 item
Category
  1. Receiver Parts 9 items
  2. Parts & Kits 5 items
  3. Barrels 35 items
  4. Rifle Barrels 30 items
  5. Gas Systems 1 item
  6. Muzzle Devices 1 item
  7. Bolt Parts 2 items
  8. Rifle Handguards 5 items
  9. Stocks & Braces 2 items
Color
Configuration
  1. AR-15 14 items
  2. .625 DIA 1 item
  3. .750 DIA 7 items
Finish
  1. Bead Blast 1 item
  2. Nitride 8 items
  3. Phosphate 1 item
  4. Polished 8 items
  5. Satin 11 items
  6. Quench Polish Quench (QPQ) 1 item
Gas Block Diameter
  1. .625" 2 items
  2. .750" 25 items
  3. .875" 6 items
Gas Length
  1. Pistol 2 items
  2. Carbine 4 items
  3. Mid 11 items
  4. Intermediate 22 items
  5. Rifle 32 items
  6. Rifle +1 2 items
  7. Rifle +2 1 item
Manufacturer
  1. Ballistic Advantage 6 items
  2. Boss Barrels 2 items
  3. Bravo Company MFG (BCM) 2 items
  4. Centurion Arms 1 item
  5. Faxon Firearms 5 items
  6. JP Enterprises Inc 4 items
  7. KNS Precision 1 item
  8. Magpul Industries 7 items
  9. Noveske 7 items
  10. Rainier Arms, LLC 37 items
Mount
  1. M-LOK 1 item
  2. Picatinny 20 items
Option
  1. AR-10 7 items
  2. AR-15 12 items
  3. Adjustable 1 item
Platform
  1. AR-10 4 items
  2. AR-15 10 items
  3. Remington 700 4 items
  4. Ruger Precision Rifle 4 items
  5. Savage Small Shank 4 items
Price
  1. $0.00 - $999.99 72 items
  2. $1,000.00 and above 3 items
Product Type
  1. AR-10 Barrel 4 items
  2. AR-15 Assembled Upper Receiver 1 item
  3. AR-15 Barrel 7 items
  4. AR-15 Complete Upper Receiver 2 items
  5. AR-15 Partial Upper Receiver 2 items
  6. AR-15 Upper Receiver Group 1 item
  7. Barrel 29 items
  8. Bolt 2 items
  9. Bolt-Action Barrel 12 items
  10. Bolt Catch 1 item
  11. Cheek Riser 2 items
  12. Flash Hider 1 item
  13. Forearm Accesory 5 items
  14. Gas Block 1 item
  15. Lower Parts Kit 1 item
  16. Take Down / Pivot Pins 2 items
Rail Length
  1. 12" 20 items
  2. 12.5" 1 item
  3. 15" 1 item
Size
  1. 9 Slot 13 items
Thread Pitch
  1. 1/2x28 13 items
  2. 5/8x24 32 items
Threaded
  1. Yes 10 items
Twist Rate
  1. 1:7 8 items
  2. 1:7.5 12 items
  3. 1:8 20 items
  4. 1:10 6 items
Stock Status
  1. In stock 59 items
  2. Out of stock 16 items
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